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icomfortt Touch Screen 7−Day Programmable Thermostat
Page 3
icomfortt Thermostat Terms and Acronyms
Subnet Controller (SC): (part of the communicating thermostat) Local
device that controls the system.
Subnet: A part of the communication network that contains devices to
control one functional HVAC system.
RSBus − Residential Serial Bus − the means for transmitting data within
the communicating system.
Controller Area Network Protocol: Rules for networking, for transmis-
sion and receipt of information between communicating systems.
Baud Rate: Maximum speed of BUS 40K baud.
Byte: 8 bits of information transmitted on the RSBus.
Integrated Furnace Control (IFC): Communicating control for furnace.
IFC controls ignition, CAI, blower, and monitors all safety features in the
unit.
Air Handler Control (AHC): Communicating control for air handler
units. AHC controls operation of blower, heat strips, and monitors all
safety features in the unit.
HP Control (Defrost Control) (UC): Communicating defrost control.
UC controls low and high speed compressor operation, defrost opera-
tions, fan motor, and reversing valve and monitors all safety features in
the unit.
AC Control: Communicating air conditioning control. AC controls low
and high speed compressor operation, fan motor operation, and all safe-
ty monitors in the unit.
Discharge Air Sensor (DAS): Communicating discharge air sensor.
Provides discharge air temperature to Bus, UI, and IFC for proper opera-
tion of equipment.
R: 24V power
C: 24V common
i+: + data information connection
i−: − data information connection
Configuration: Function that accrues during setup of system to identify
other communicating devices. Configuration is also used in setup of a
variable capacity furnace to properly set furnace parameters.
Memory Fault Recall: Method of checking for errors
Firmware: Software stored on a memory chip instead of being part of a
program
Software: Programming and applications for computer